Grinding machines for cutter tools



J. A. ANANIA GRINDING MACHINES FOR CUTTER TOOLS Sept. 16, 1958 INVENTOR'1' Sheets-Sheet l Filed Feb. 7. 1955 BY fig ATTORNEY Filed Feb. 7, 1955J. A. ANANIA 2,851,83

GRINDING MACHINES FOR CUTTER TOOLS '7 Sheets-Sheet 2 IN VENTOR Jazz 2&9A. Azaarula 7Z0". ATTORNEY p 1958 J. A. ANANIA 2,851,832

GRINDING MACHINES FOR CUTTER TOOLS Filed Feb. 7, 1955 7 Sheets-Sheet 3INVENTQR BY yz ff ATTORNEY Sept.- 16, 1958 J. A. IANANIA 2,851,332

GRINDING MACHINES FOR CUTTER TOOLS Filed Feb. 7, 1955 7 Sheets-Sheet 4ATTORNEY INVENTOR fl fizazaa,

w W m P 16, 1958' .1. A. ANANIA 2,851,832

' GRINDING MACHINES FOR CUTTER TOOLS Filed Feb. 7, 1955 7 Sheets-Sheet 5T 7 i 5 i 7 I 70 l I 75 (L-\ 111 Y U 122i:

4 V 116 A V 115 INVENTOR .IQJRGSA. Amalia,

. ATTORNEY Sept. 16, 1958 J. A. ANANIA 2,851,832

GRINDING MACHINES FOR CUTTER TOOLS Filed F b fv, 1955 'r Sheets-Sheet 7Fig). 14.

l 7 F -1NVENTOR ATTORNEY GRINDING MACHINES FOR CUTTER TOOLS James A.Anania, Newark, N. J., assignor of twenty-five percent to Frederick L.Knecht, Glen Rock, and fifty percent to William J. Matt, Jr., Westfield,N. J.

Application February 7, 1955, Serial No. 486,605

2 Claims. (Cl. 51-218) This invention relates to an improved grindingmachine for machine tools.

One of the objects of the invention is to provide a machine especiallyadapted to grind the cutters of the cutter tool assembly shown in myco-pending application filed June 28, 1954, Serial Number 439,613, newPatent No. 2,799,917.

A further object of the invention is to provide a machine wherein theseveral cutters of the cutter head employed may be selectively groundwithout the necessity for removing the cutters from the cutter head.

Another object of the invention is to provide a machine embodying asource of power for rotating the grinding wheel employed, and anothersource of power for rocking said wheel into and out of engagement with.the work, so that the wheel may not be caused to tarry in. engagementwith the work should the rotation of the wheel be retarded by contact ofthe wheel with the work.

A further object of the invention is to provide a machine wherein thegrinding wheel will be rotated at a relatively high rate of speed,while, in relation to the rotary speed of said wheel, the wheel will berocked back and forth more or less slowly, and wherein the rotary speedof said wheel as well as the rocking motion thereof may each beseparately regulated and varied.

Another object of the invention is to provide a machine embodying a toolpost especially adapted to support the cutter head for grinding the sidefaces of the cutters at a right angle to the upper end faces of saidcutters, wherein manually controlled power driven means will be providedfor rotatably setting said post, wherein another post will be providedto support the head for grinding the side faces of the cutters when itis desired to rotatably set the post by hand exclusively, whereinanother post will be provided to support the head for grinding the fullside faces of the cutters, and wherein still another post will beprovided to support the head for grinding the upper end faces of thecutters.

And a still further object of the invention is to provide a machinewherein the tool post may be adjusted forwardly or backwardly to eitherincrease or decrease the width of grind, and may also be adjustedlaterally to either increase or decrease the depth of grind.

Other and incidental objects will appear as the description of theinvention proceeds, and in the drawings:

Figure 1 is a side elevation of my improved grinding machine.

Figure 2 is a top plan view of the machine.

Figure 3 is a vertical, longitudinal section on the line 3-3 of Figure2.

Figure 4 is a front end elevation of the machine; parts being shown insection.

Figure 5 is a detail perspective view of the tool post carriage, theparts being shown separated but in proper relative position.

Figure 6 is a detail plan view of the tool post carriage, and showing acutter head thereon.

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Figure 7 is a detail, transverse, vertical section through the post andhead of Figure 6.

Figure 8 is a detail, transverse, vertical section showing a tool postadapted to be rotatably set manually.

Figure 9 is a detail plan view of a tool post adapted to set the cutterhead in inclined position.

Figure 10 is a detail, transverse, vertical section through the post ofFigure 9.

Figure 11 is a detail, transverse, vertical section on the line 11-11 ofFigure 9. Figure 12 is a detail plan view of a tool post adapted tosupport the cutter head for grinding the upper end faces of the cuttersthereof.

Figure 13 is a detail front elevation of the tool post of Figure 12.

Figure 14 is a detail, transverse, vertical section through the post ofFigure 12.

In carrying the invention into effect, I employ a frame embodying afiat, oblong base plate 10, and secured to,

said plate at the corners thereof are suitable legs 11 between the frontand rear pairs of which extends transverse tie rods 12. Appropriatelyfixed to the base plate in parallel relation are vertical side plates 13and 14 reinforced at their lower margins by side strips 15, andextending between the lower portions of the plates near their front andrear ends are tie rods 16. As will be observed, the side plates 13 and14 are set inwardly from the side edges of the base plate 10 to providea shelf 17 at one side of the frame, and a like shelf 18 at the oppositeside of the frame.

Mounted upon the shelf 17 to project through a suitable opening in theside plate 13 near the rear end thereof is an electric motor 19 which,in comparison with another motor employed, as will be later explained,is designated a high speed motor, and connected to the lead 20 of themotor is a plug 21. Fixed to the adjacent leg 11 of the frame at theforward end of the shelf 17 is a block 22 upon which is mounted anappropriate multiple socket fixture 23, and plugged into said fixture isthe lead 24 of a suitable double outlet 25 mounted upon the shelfadjacent the motor 19. The plug 21 is normally engaged in one of thesockets of the outlet 25, and the other socket 26 of said outlet isprovided so I that the extension cord of a conventional hand lamp may beplugged into the socket to provide a convenient light for the personoperating the machine. Mounted upon the shelf 17 forwardly of the outlet25 is a suitable rheostat 27 connected in the circuit of the motor 19 bywires 28 and adjustable for varying the speed of the motor. The motor19, fixture 23, outlet 25, and rheostat 27 are all conventionally shown,and the particular circuits employed are not especially important exceptthat suitable means be provided for varying or regulating the speed ofthe motor 19.

Extending between the side plates 13 and 14 medially thereof is atransverse shaft 29, the ends of which are journaled in bearings 30, andmounted to rock on said shaft is a flat arm 31 rectangular in crosssection. Formed on the lower end of said arm at its side edges is alower yoke embodying circular cheek plates 32, and

, formed on the arm at its upper end is a similar upper yoke comprisingcircular cheek plates 33 somewhat smaller in diameter, however, than thecheek plates 32. The plates 32 of the lower yoke are journaled upon theshaft 29 so that the arm 31 may freely rock thereon, and lineallyadjustable upon said plates are depending rods 34 which extend in aplane with the arm and carry counterweights 35. Thus, by adjusting therods 34 on the cheek plates 32, the arm 31 may be balanced on the shaft29. Journaled through the cheek plates 33 of the upper yoke of the arm31 is a shaft 36, and removably fixed to the inner end of said shaft isa flat grinding wheel 37 of approved character.

Iournaled upon the side plates 13 and 14 rearwardly of the motor 19 is atransverse shaft 38, and extending between the armature shaft of themotor and the shaft 38 is a drive belt 39. Extending between the shaft38 and the shaft 29 is a drive belt 48, and extending between the shaft29 and the grinding wheel shaft 36 is a drive belt 41 which straddlesthe arm 31, suitable pulleys being provided on the several shafts forsaid belts. As will be perceived, when the motor 19 is energized, thegrinding wheel 37 will be rotated at high speed, while by adjusting therheostat 27 and thus varying the speed of the motor, the rotation of thegrinding wheel may in turn be set at the speed desired.

Mounted upon the forward end portion of the shelf 16 of the frame toproject through a suitable opening in the side plate 14 is an electricmotor 42, which, in comparison with the motor 19, is designated a lowspeed motor, and extending from the motor 42 is a lead 43 having a plug44. Fixed to the shelf 18 rearwardly of the motor 42 is a double outlet45, like the outlet 25. The plug 44 of the motor is normally engaged inone of the sockets of said outlet, the other socket 46 of said outletbeing for the same purpose as explained in connection with the socket 26of the outlet 25, and connected to the outlet 45 is a lead 47, theterminal plug 48 of which is normally engaged with the' fixture 23.Mounted upon the rear end portion of the shelf 18 is a suitable rheostat49, like the rheostat '27. The rheostat 49 is connected in the circuitof the motor 42 by wires 50 and is adjustable for varying the speed ofthe motor. The motor 42, outlet45, and rheostat 49, as in the instanceof like elements previously described, are conventionally shown, and, asformerly stated, the particular circuits employed are not especiallyimportant, except that suitable means be provided for varying orregulating the speed of the motor 42. A conventional current supply leadis shown as plugged into the fixture 23 for furnishing current to bothof the motors 19 and 42.

Fixed to the rear end portion of the side plate 14 of the frame andspaced inwardly from said plate in parallel relation thereto is a panel51, and fixed to said panel is a stub shaft 52. Journaled upon the shaftis a sleeve which carries a sprocket 53 at one end and a gear 54 at itsother end, and journaled through the panel forwardly of the shaft 52 isa shaft 55 provided at one end, at the inner side of the panel, with acircular head 56 and at its opposite end, at the outer side of thepanel, with a gear 57 meshing with the gear 54. The armature shaft ofthe motor 42 carries a sprocket 58, and extending between the sprockets53 and 58 is a sprocket chain 59. Thus, when the motor is energized, thehead 56 will be rotated.

Projecting inwardly from the head 56 of the shaft 55 at diametric pointsare lateral posts 60, and fixed to said posts is a cross rod 61extending diametrically of the head. Slidably adjustable upon the rod isa crank sleeve 62 from which extends a lateral crank pin 63, andjournaled upon said pin is a pitman sleeve 64 fixed to the lower end ofa pitman 65. Extending laterally from the grinding wheel arm 31 mediallythereof is a crank pin 66 upon which is journaled a pitman sleeve 67,and extending radially from said sleeve medially thereof is a head 68which slidably receives the upper end portion of the pitman 65therethrough. Screwed on the pitman to abut opposite sides of the head68 are nuts 69 adjustable for varying the effective length of thepitman.

The sleeve 62 is positioned upon the rod 61 away from the axis of thehead 56, so that when the head is rotated, as previously described, thearm 31 will, as will now be understood, be rocked back and forth toswing the grinding wheel 31 forwardly and backwardly in an arcuate path.As will be seen, the travel of the arm 31 will be determined by theradius of the Pin 63 with respect to the axis of the head 56,Consequently, the length of the arcuate throw of the grinding wheel 37may be increased or decreased by adjusting the sleeve 62 along the rod61. Furthermore, it is also to be noted that the effective length of thepitman 65 will determine the setting of the arm 31 around a circleconcentric to the shaft 29. Accordingly, as will now be clear, thesegment of arcuate travel of the grinding wheel may be lowered byincreasing the effective length of the pitman 65, or raised bydecreasing the effective length of the pitman. The particular objectivesof the adjustments just described will be later explained.

Fixed to the forward ends of the side plates 13 and 14 flush with theupper edges thereof is a cross plate '70 in which is formed alongitudinal slot 71, and slidable upon the plate is the tool postcarriage employed. This carriage includes an L-shaped bottom sectioncomprising a relatively thick bottom bar 72 of rectangular crosssection, and an integral, rectangular side plate 73 which projectslaterally from the inner end portion of said bar. The plate 73, which isof a width corresponding to the width of the cross plate 70, overliesthe cross plate, and formed on the lower side of the bar in alignmentwith the forward edge of the side plate is a shoulder 74 which abuts theforward longitudinal edge of the cross plate. Detacha'bly secured to theinner end of the bar 72 is a keeper plate 75 which engages beneath thecross plate to slidably connect the bottom section of the carriage withsaid cross plate and sustain the bar 72 to extend forwardly from thecross plate at a right angle thereto. Formed in the bar 72 mediallythereof is a longitudinal slot 76, and detachably or otherwise fixed tothe outer end of said bar is a head 77.

The tool post carriage further includes a top section which comprises anoblong top bar 78 which slidably rests upon the bottom bar '72 matingticrewith, the top bar being, however, somewhat thicker than the bottombar. Formed on the top bar 78 is a tongue 79 which slidably fits in theslot 76 of the bottom bar 72, and snugly straddling both bars is a yoke89, the sides of which are detach-ably fixed to the top bar '78. Theyoke thus slidably connects the top bar with the bottom bar for forwardand rearward movement on said bottom bar. Formed in the top bar 78 nearits inner end is a socket 81.

Journaled through the keeper plate 75 and through the head 77 of thebottom bar 72 is a screw shaft 82 which is screwed through the yoke andis provided at its forward end with a knob 83. Thus, as will beunderstood, the knob 33 may be manually turned for adjusting the top bar78 either forwardly or rearwardly upon the bottom bar 72. If so desired,the head 77 may be provided with suitable graduations, so that the knob83 may be turned to obtain an accurate adjustment of said top bar.

Journaled upon the side plates 13 and 114 of the frame beneath the crossplate 70 is a screw shaft 34, and depending from the side plate 73 ofthe bottom section of the tool post carriage is an arm 85 detachablyconnected at its upper end to a head 86. The head 86 may be integrallyformed on the plate 73 or otherwise fixed thereto and provides a tongueon the plate slidably fitting in the slot 71 of the cross plate 70 forguiding the bottom section of the carriage when the carriage is shiftedlaterally in a direction along the cross plate. Formed on the lower endof the arm 85 is a sleeve 87 screwed on the shaft 84.

Fixed to the rear end of the side plate 13 is a lateral bracket plate 88which is provided with a head 89, and fixed to the plate 13 at itsforward end is a block 90 which receives the adjacent end of the shaft84 therethrough and is recessed to accommodate a worm wheel 91 fixed tosaid shaft. Journaled at its forward end upon the block 90 and at itsrear end portion through the plate 33 and head 89 is a hand shaft 92 tothe forward end of which is fixed a worm 93 engaging the worm wheel 91,and fixed to the rear end of said shaft is a hand wheel 94 which carriesa crank handle 95. As will be perceived, the shaft 92 may thus bemanually'r'otated for turning the shaft 84and adjusting the tool p'ostcarriage laterally with respect to the path of arcuate travel of thegrinding Wheel 37. If so desired, the head 89may be provided withsuitable graduations, so that the tool post carriage may be laterallyadjusted accurately.

Journaled upon the side plates 13 and 14 of the frame near theforward'ends' of .said plates above and forward- 1y of the low speedmotor. 42 is a transverse shaft 96, and extending between the armatureshaft of said motor and the shaft 96 is a drive belt 97 trained aboutsuitable pulleys on said shafts. Journaled at their outer ends upon theside plates 13 and I4 forwardly of the motor 42 and near the base plateare aligned shafts 98 and 99, the inner end portions of which arecarried by bearings 100 rising from the base plate, and extending aboutsuitable pulleys onthe shafts 96 and 98 is ,a drive belt 101. Fixed tothe inner end of the shaft 98 is a clutch disk 102, and splined upon theinner end of the shaft 99 is a coacting clutch disk 1'0'3 shifta-ble toengage the disk 102 by a hand lever 104 pivoted at its lower end uponthe base plate 10.

At its outer end, the shaft 99 carries a bevel gear 105, and meshingwith said gear is a bevel .gear 106 journaled by a bearing bracket 107fixed to the side plate 13. Fixed to the adjacent edge of the top bar 78of the tool post carriage is a bearing bracket 108-which journals abevel gear 109, the axis of which is disposed in a plane with thevertical axis of the socket 81, and extending between the gears 106and109 is "a flexible cable 110. Thus, when the handlever 104 is thrown toengage the clutch disk 103 with the clutch disk-102, the gear 109 will,as will be seen, be rotated by the motor 42.

Mounted upon the top bar. 78 of the tool post carriage isa stopscrewi'lll'disposed opposite the gear 109,-and removably fitting at itslower end in the socket 81 of said bar is a .t'oolpost 112, the lowerend of which isiprovided with an annular groove 113 in which the innerend of the screw 111 is engaged for limiting the post against upwarddisplacement while also permitting free rotation of the post. Formed onthe tool post 112v at a point near above the groove 113 is a bevel gear114 which meshes with the gear 109 and rests against the upper faceofthebar 78 to provide a bearing. plate rotatably supporting the post uponsaid bar, andformed on the post near above the gear 114 is a circularrest plate 115 inwhich is provided a socket 116. As will. be appreciatedin view of the previous description, when. the hand lever 104 is thrownto couple the shafts 98 and. 99, the tool post 112 will be mechanicallyrotated. Formed in the upper face of the top bar 78 of the carriageabout the axis of the socket 81 is a series of quadrantly spaced sockets117, and mounted upon the gear 114 is a spring-pressed ball detent 118cugageable in said sockets selectively for locating therotated positionof the post and normally holding the post stationary.

As previously indicated, the machine of the present invention isespecially designed for grinding the cutters of the cutter head showninmy prior application heretofore identified, and in order to betterbring out the operation of the present machine, I have shown a likecutter head 1'19 disposed upon the post 112 and seated upon the restplate 115. Briefly, it may be noted that the head 119 is formed .at itsupper and lower sides with like sockets 120, and projecting from thehead are quadrantly spaced cuttenrests 121 upon which are seatedsuitable cutters 122.

Each cutter and resttherefor, considered as a unit, is V- shaped. incross section as Well as V-shaped in vertical section. so that the sidesof each unit converge radially outward and also converge downwardlytoward the lower side of thehead. The upper end-faces of'the cutters areflat. Formed through the head near the base of each cutter is a verticalopening 123.

For the. purposes,of.the-present invention, I employ a filler. ring 124which is removably seated in the upper socket 1200f thehead 119,. andscrewed upon the upper end of the post 112 is a nut 125 coacting with acollar 126 for removably securing the'head in position. Disposed in oneof the openings 123 of the head is a pin 127 engaged'at its lower end inthe socket 116 of the rest plate for locking the head against rotationindependently of the tool post.

Assuming now that the tool post carriage is disposed in a lateralposition with respect to the plane of rocking movement of .the grindingwheel 37 to support the cutter head 119 in the position shown in fulllines in Figure 6 of the drawings, it will be seen that one side face ofone of the cutters 122 will be presented parallel at itsupper edge tosaid plane. Thus, further assuming that the machine is in operation, itwill also be seen that as the grinding wheel 37 approaches the end ofits forward throw, the adjacent side of the Wheel will, due to the factthat the downward slope. of said side face of the cutter will inclineaway. from the wheel, grind said side face of the cutter along thelin'eof its junction with the flat upper end face of said'cutter to form asharp edge, it being noted, in this connection, that the grinding wheelis mounted to rock in a fixed vertical plane.

As the back and forth motion of the grinding wheel 37 is continuous,said wheel will, after brushing the cutter being ground, he rockedbackwardly away from said cutter, when the hand lever 104 may be thrownto cause rotation of the tool post 112 and head 119 ninety degrees anddispose a side face of the next cutter 122 in a position to be ground.Thus, as will be understood, corresponding side faces of all of thecutters may be ground successively, and in order that the oppositecorresponding side faces of the cutters may be successively ground, thetool post carriage is shifted laterally to the position shown in dottedlines in Figure 6 of'the drawings, when, as will be understood, thecutter head may again be intermittently rotated to successivelypresenteach of said opposite correspondingc ide faces of the cutters inposition to be ground. As will be perceived, grinding of the cutters maybe easily and quickly accomplished.

The tool post 112 is proportioned to support the cutter head 119, andconsequently the cutters 122, at a mean height above the tool postcarriage such that, as regards the cutter being ground, the grindingwheel .37 will first engage said cutter at a mean point near the end ofthe arc of the forward throw of said wheel, and consequently, for givendiameter of the grinding wheel and given setting of the sleeve 62 andgrinding wheel arm, 'as previously described, the length of grind, aswill be cle vtermined by the movement of the grinding wheel along theedge of the cutter being ground, will remain constant for givensettingof the block 78 of the tool post carriage, as will alsothe'vertical width of grind, determined by the width of the peripheralportion of the diameter of. the grinding wheel caused to engage thecutter. As will be perceived, the length of grind as well as thevertical width of grind may be initially set, roughly, by adjusting thesleeve 62 to either lengthen or shorten the arcuate travel of thegrinding wheel 37, as previously described, and then subsequently set toa nicety by adjusting the effective length of the pitman 65, as alsopreviously described.

As heretofore noted, the knob 83 of the shaft 82 is operable forshifting the top block 78 of the tool post carriage either forwardly orbackwardly, and when a cutter 122 of the head 119 is being ground, isemployed to feed the cutter toward or away from the arcuate path of thegrinding wheel 37 for either increasing or decreasing the length ofgrind as well as the width of grind. Also, as heretofore noted, the handwheel 94 is operable for shifting the tool post carriage laterally andaccordingly is employed to move the cutter head 119 from the full lineposition shown in Figure 6 of the drawings to the dotted line positionshown. In either position of the cutter head, the hand wheel 94 isfurther employed to adjust the tool post carriage laterally and, inrespect to the cutter being ground, feed said cutter into the path ofthe grinding wheel 37 for depth of grind.

In connection with the grinding operation, the desirability of rotatingthe grinding wheel 37 at high speed is to be noted. At the same time, itis also equally desirable to rock said wheel back and forth more or lessslowly. Accordingly, I employ the high speed motor 19 for driving thegrinding wheel, and the low speed motor 42 for rocking the grindingwheel back and forth. As will be perceived, the speed of the wheel andthe frequency of rocking motion of the wheel may be independently variedby separately regulating the speed of the motors. An equally importantreason for employing separate motors, as compared with a single motor,lies in the fact that should the cutter being ground be fed to thegrinding wheel too fast, the wheel might stick and momentarily cause thespeed of the motor 19 to slow down. Such slowing down of the speed ofthe motor 19 will, however, in no way affect the speed of the motor 42,so that sticking of the wheel will not cause the wheel to tarry in itsrocking motion in engagement with said cutter.

In Fig. 8 of the drawings, I have shown a tool post 128 adapted to bemanually rotated for selectively disposing the several cutters of thecutter head 119 in a position to be ground. The post 128 is providedwith a rest plate 129 which seats the cutter head, and securing thecutter head in position is the nut 125 and collar 126, the rest platebeing recessed to receive the lower end of a locking pin 130, like thepin 127. The lower end of the post 128 is formed to fit in the socket 81of the top bar 78 of the tool post carriage, and is grooved to receivethe inner end of the stop screw 111. Formed on the post to seat againstthe upper face of the bar 78 is a circular bearing plate 131 whichcarries a radial hand lever 132, and mounted upon the plate toselectively engage in the sockets 117 of said bar is a spring-presseddetent 133, like the detent 118. As will be observed, the bearing plate131 does not coact with the gear 109, so that the tool post may befreely rotated manually by means of the lever 132. Otherwise, the post128 conforms to the construction of the post 112.

In Figures 9, l0, and 11 of the drawings, I have shown a tool postadapted to be manually rotated as well as adapted for the same grindingoperation performed when the axis of the cutter head 119 is disposedvertically, while, also, a full side face of any one of the cutters ofthe cutter head may be presented flat to the grinding wheel. The toolpost comprises a lower section 134, and an upper section 135 pivotallyconnected to the lower section by a clamp screw 136 which may betightened for securing the upper section in adjusted position withrespect to the lower section. The lower section is formed at its lowerend to fit in the socket 81 of the top bar 78 of the tool post carriage,being grooved to receive the inner end of the stop screw 111, and formedon the section to seat against the upper face of the bar 78 is a hearingplate 137 which carries a spring-pressed detent 138 to engage in achosen one of the sockets 117 of said bar. The stop screw 111 is set uptight against the lower end of the post, in this instance, for lockingthe lower section of the tool post against rotation.

The upper section 135 of the tool post is provided with a rest plate139, and fitting said section of the post to overlie the rest plate is ashoe plate 140 having a radial hand lever 141. The cutter head 119 isseated upon the shoe plate 141), being retained by the nut 125 andcollar 126, and said plate is recessed to receive the lower end of alocking pin 142, like the pin 127. Formed in the lower face of the shoeplate 140 is a series of quadrantly spaced sockets 143, and mounted uponthe plate 139 to selectively engage in said sockets is a spring-presseddetent 144. Thus, the shoe plate 140 may be manually rotated toselectively dispose either side face of any one of the cutters 122 inposition for grinding, when the detent 144 will serve to hold the headin adjusted position.

Assuming now that it is desired to grind corresponding side faces of thecutters 122, the upper section of the tool post is tilted in onedirection to a position corresponding to the downwardly sloping angle ofsaid side faces of the cutters, so that the entire area of each of saidfaces will be successively presented fiat to the grinding wheel, while,when it is desired to successively grind the opposite corresponding sidefaces of the cutters, the upper section of the tool post is tilted inthe opposite direction, as will be understood. When grinding the fullside faces of the cutters, the side faces of the cutter rests 121 willbe worn away somewhat, but practical use of the cutter head has shownthat this factor is immaterial. It is also to be noted that bypositioning the upper section 135 of the tool post vertically, said postmay be employed in the same manner as the tool post 128 previouslydescribed.

In Figures 12, 13 and 14 of the drawings, I have shown an angle-shapedtool post adapted for use in grinding the upper end faces of the cuttersof the cutter head. This tool post includes a flat bottom plate 145 fromwhich rises a vertical side plate 146, and extending through the bottomplate is a stud bolt 147 which fits in the socket 81 of the top bar 73of the tool post carriage and is grooved to receive the inner end of thestop screw 111. The stop screw is set up tight against the bolt, so thatthe tool post will be clamped against rotation.

The plate 146 carries a set screw 148, and resting against the frontface of said plate is a circular shoe plate 149 which seats the cutterhead 119 and is recessed to receive the inner end of a locking pin 150,like the pin 127. The cutter head is thus locked to the shoe plate, andextending through the head, the shoe plate, and the side plate 146 ofthe tool post is a bolt 151 rotatably mounting the head and shoe plateand which receives a nut 152 and collar 153, like the nut 125 and collar126.

As will be seen, the cutter head 119 is mounted on the plate 146 of thetool post in a vertical plane, so that the flat upper end faces of thecutters 122 may be presented fiat against the grinding wheel 37.Accordingly, by rotatably adjusting the head, each of said faces may bedisposed in a position to be ground, when the screw 148 is tightenedagainst the shoe plate 149 for locking the head in adjusted position.

Having thus described my invention, I claim:

1. In a grinding machine, a frame, a tool post carriage mounted thereonand including a bottom section and a mating top section slidableforwardly and rearwardly upon the bottom section and formed to mount atool post, means carried by the frame slidably mounting the bottomsection and supporting the carriage for lateral movement, adjustingmeans carried by the frame and operatively connected to said bottomsection for shifting the carriage laterally, adjusting means mountedupon the bottom section and operatively connected to the top section forshifting the top section forwardly and rearwardly, a gear journaled uponthe top section and disposed to rotate a tool post mounted upon said topsection, powerdriven means carried by the frame and operativelyconnected to said gear for rotating the same, and means interposed inthe connection between said power-driven means and said gear andmanually operable to control the rotation of said gear step by step.

' 2. In a grinding machine, a frame including a base plate, spaced sideplates rising therefrom, a cross plate extending between the upperportions of the side plates,

a tool post carriage including a bottom section slidable laterally alongsaid cross plate and a top section slidable forwardly and rearwardlyupon the bottom section and formed to mount a tool post, adjusting meanscarried by the frame and operatively connected to said bottom section ofthe carriage for shifting the carriage laterally, adjusting meansmounted upon the bottom section of the carriage and operativelyconnected to the top section for shifting the top section forwardly andrearwardly, a drive shaft journaled at its outer end upon one of saidside plates, an aligned driven shaft journaled at its outer end upon theother of said side plates, bearings rising from the base plate andjournaling said shafts near their inner ends, said shafts being disposednear said base plate beneath said cross plate, a manually operableclutch operatively connected with the inner ends of said shafts forcoupling the shafts to turn in unison, a gear fixed to the outer end ofsaid driven shaft, a driven gear journaled upon the adjacent side plateof the frame near the outer end of said driven shaft and meshing withthe former gear, a gear journaled upon the top section of the carriageand disposed to rotate a tool post mounted on said top section, and aflexible drive cable extending between said driven gear and the gear ofsaid top section of the carriage and of a length to accommodate lateralmovement of the carriage as well as forward and rearward movement ofsaid top section.

References Cited in the file of this patent UNITED STATES PATENTSHaddock Jan. 18, 1876 McGehe May 12, 1891 Lumsden June 20, 1916 CallawayJune 19, 1917 Munthe Oct. 3, 1922 Glancy Aug. 5, 1924 Sann Apr. 3, 1928White May 17, 1932 Remington Aug. 8, 1933 Yassenotf June 19, 1934 HilleNov. 20, 1934 Connor Feb. 8, 1938 Fullerton Sept. 24, 1940 Harrold Feb.25, 1941 Osborn Mar. 20, 1956

